Readers offer their best tips for building your own 3D projector, coordinating group photos for events, and studying more effectively.

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Every day we receive boatloads of great reader tips in our inbox, but for various reasons—maybe they're a bit too niche, maybe we couldn't find a good way to present it, or maybe we just couldn't fit it in—the tip didn't make the front page. From the Tips Box is where we round up some of our favorites for your buffet-style consumption. Got a tip of your own to share? Add it in the comments, email it to tips at lifehacker.com, or share it over at our user-run blog, Hackerspace.

Build Your Own DIY 3D Projector

Nicolas shares his build for a DIY 3D projector:

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Since Lifehacker has mentioned DIY projectors in the past, I thought you might be interested in learning about a project I did that combines both. The trick is to consider the two halves of your LCD screen as two separate screens that you need to project using separate optics.

Upload Group Event Photos to Google Drive with EntourageBox

Frank shares how he coordinated everyone's photos from a school trip:

I am parent volunteer for my son's high school marching band and one of the website admins for the supporting booster club. The band is taking a trip to Disney to perform. A lot of parents are going along to enjoy the show.

Everyone will be taking pictures & videos. We want copies of photos so that we can post them on our website and we wanted a simple method for people to share with us. One of our solutions was to set up an EntourageBox that links directly to our Google Drive. It seems to be working pretty well.

Study in Stress Conditions Similar to Your Test Environment

Carlos shares a tip for preparing for a stressful exam:

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I was studying for my medical boards and it occurred to me that being in a quiet room wouldn't prepare me for the stress of performing under pressure. Knowing that epinephrine mediates the stress response and that heavy aerobic exercise increases epinephrine, I started doing practice tests on a high resistance stationary bike at the gym on my smart phone. When I got to the testing center I was prepared to deal with the heart pounding and sweating my nerves had in store for me. I immediately thought of Lifehacker.

Even if you don't want to go quite this far in your preparation, context dependent memory is a real thing and there are milder steps you can take. For example, if you know you'll be taking your exam in an uncomfortable seat under fluorescent lights, try studying that way, too.

Build a Christmas Tree Arduino Shield

This is my latest project with Arduino—a Christmas tree Arduino Shield based on WS2812b. The circuit consists of twenty WS2812 LEDs and a Piezo buzzer, creating a nice show of multicolored lights while playing 'Jingle Bells'.